I am saving my money for a set of higher powered binos. For me it's between the Maven B4, Sig Zulu 9 and Leupold BX5 in 15x56. I suspect they are all made in the same Japanese factory since they have such similar specs and use the Abbe Koenig prisms. Optics Planet carries the Sigs and the Leupolds, you could order both and return one?